Game machine, control method of controlling computer used in game machine, and computer program

Abstract

A game machine comprising a roulette game unit in which a lottery is executed by a roulette game, wherein a deceleration interval which is an interval to decelerate a roulette ring in the roulette game is changed so that lottery time which is time taken for one lottery of the roulette game unit falls within a predetermined target range. Further, the deceleration interval is changed based on the lottery time of past lottery executed by the roulette game unit.

1 . A game machine comprising a physical lottery mechanism in which a lottery is executed by a roulette game, wherein the game machine comprises
 a parameter changing device configured to change a parameter value which affects lottery time, which is time taken for one lottery of the physical lottery mechanism, of the lottery to be executed by the physical lottery mechanism based on the lottery time of at least one past lottery executed by the physical lottery mechanism, so that the lottery time falls within a predetermined target range.   
     
     
         2 . The game machine according to  claim 1 , wherein
 the parameter changing device is configured to change the parameter value before starting the lottery by the physical lottery mechanism and prohibit the change of the parameter value while the lottery is being executed.   
     
     
         3 . The game machine according to  claim 1 , wherein
 when the parameter changing device changes the parameter value, the parameter changing device is configured to prohibit the change of the parameter value until the lottery is executed by the physical lottery mechanism predetermined number of times after changing of the parameter value.   
     
     
         4 . The game machine according to  claim 1 , wherein
 the physical lottery mechanism includes: a roulette ring having plural pockets which are arranged in a circumference direction over a whole circumference; and a ring drive mechanism which rotates the roulette ring at a predetermined lottery starting speed when the roulette game is started and then decreases a rotation speed of the roulette ring gradually from the lottery starting speed at a predetermined deceleration interval, wherein   the parameter is the deceleration interval.   
     
     
         5 . The game machine according to  claim 4 , wherein
 the parameter changing device is configured to change the deceleration interval based on an average lottery time which is an average of the lottery time obtained by the predetermined number of times of nearest lotteries executed by the physical lottery mechanism.   
     
     
         6 . The game machine according to  claim 5 , wherein
 the parameter changing device is configured to decrease the deceleration interval when the average lottery time is greater than an upper limit of the target range, and to increase the deceleration interval when the average lottery time is less than a lower limit of the target range.   
     
     
         7 . The game machine according to  claim 1 , wherein
 the physical lottery mechanism includes a roulette ring having plural pockets which are arranged in a circumference direction over a whole circumference; a ball guidepath, an upper surface of which the ball travels on, is provided on an outer circumference of the roulette ring; and an angle changing mechanism which changes an angle between an upper surface of the roulette ring and the upper surface of the ball guidepath, wherein   the parameter is the angle between the upper surface of the roulette ring and the upper surface of the ball guidepath.   
     
     
         8 . The game machine according to  claim 7 , wherein
 the angle changing mechanism changes the angle between the upper surface of the roulette ring and the upper surface of the ball guidepath over a section in the upper surface of the ball guidepath, the section corresponding to at least three of the pockets.   
     
     
         9 . The game machine according to  claim 7 , wherein
 the parameter changing device is configured to change the angle between the upper surface of the roulette ring and the upper surface of the ball guidepath based on an average lottery time which is an average of the lottery time obtained by the predetermined number of times of nearest lotteries executed by the physical lottery mechanism.   
     
     
         10 . The game machine according to  claim 9 , wherein
 the parameter changing device is configured to decrease the angle between the upper surface of the roulette ring and the upper surface of the ball guidepath when the average lottery time is greater than an upper limit of the target range, and to increase the angle between the upper surface of the roulette ring and the upper surface of the ball guidepath when the average lottery time is less than a lower limit of the target range.   
     
     
         11 . The game machine according to  claim 1 , wherein
 the physical lottery mechanism includes: a roulette ring having plural pockets which are arranged in a circumference direction over a whole circumference; a ball guidepath, an upper surface of which the ball travels on, is provided on an outer circumference of the roulette ring; a vibration device which is able to vibrate the ball guidepath; and a control device which operates the vibration device in a case that time elapsed from when a lottery of the physical lottery mechanism is started is greater than a predetermined determination time, wherein   the parameter is the determination time.   
     
     
         12 . The game machine according to  claim 11 , wherein
 the parameter changing device is configured to change the determination time based on an average lottery time which is an average of the lottery time obtained by the predetermined number of times of nearest lotteries executed by the physical lottery mechanism.   
     
     
         13 . The game machine according to  claim 12 , wherein
 the parameter changing device is configured to decrease the determination time when the average lottery time is greater than an upper limit of the target range, and to increase the determination time when the average lottery time is less than a lower limit of the target range.   
     
     
         14 . A control method of controlling a computer which is incorporated in a game machine comprising a physical lottery mechanism in which a lottery is executed by a roulette game, wherein the control method of controlling the computer comprises
 a parameter changing step configured to change a parameter value which affects lottery time, which is time taken for one lottery of the physical lottery mechanism, of the lottery to be executed by the physical lottery mechanism based on the lottery time of at least one past lottery executed by the physical lottery mechanism, so that the lottery time falls within a predetermined target range.   
     
     
         15 . A computer program for a game machine being configured to cause a computer, which is incorporated into a game machine comprising a physical lottery mechanism in which a lottery is executed by a roulette game, to function as
 a parameter changing device configured to change a parameter value which affects lottery time, which is time taken for one lottery of the physical lottery mechanism, of the lottery to be executed by the physical lottery mechanism based on the lottery time of at least one past lottery executed by the physical lottery mechanism, so that the lottery time falls within a predetermined target range.